I went down this path. Yes, Windows includes an inbox USB audio class driver, but it lacks support for implicit feedback. The MOTU interface does not have a feedback endpoint, and relies on implicit feedback, so the inbox driver doesn't work. I think the inbox driver does work for Focusrite's interfaces - I guess they include the feedback endpoint, and both Linux and macOS support implicit feedback so MOTU's devices work there. Apple actually recommend implicit feedback only [0].
[0] - https://developer.apple.com/library/archive/technotes/tn2274...